<VV> engine problem

jryall at juno.com jryall at juno.com
Wed Aug 15 13:18:20 EDT 2018

The bottom fin is still the raw casting surface.  The gasket surface in
the head is clean and smooth, but does not appear to be cut for
compression increase.

He has another head of the part number that doesn't fit properly, and it
has the same problem pushrod tubes stick out of the head.  This head came
from another source.  Two heads from different sources that have the same
fit problem.  Almost as if these heads were designed for a thicker


On Wed, 15 Aug 2018 13:04:03 -0400 Seth Emerson <sethracer at aol.com>
John - You used the phrase "deeper into the head". 

Is it possible that the outer face of he head was also machined when the
head gasket surfaces were cut.  This was often done so the barrel would
not bottom out on the shoulder after the gasket surface was cut. If that
was done, the .060 measurement might not fully account for the movement
of the head inboard. Just a thought. 


-----Original Message-----
From: jryall--- via VirtualVairs <virtualvairs at corvair.org>
To: virtualvairs <virtualvairs at corvair.org>
Sent: Wed, Aug 15, 2018 8:47 am
Subject: Re: <VV> engine problem

I looked at this engine this morning. The heads do not match. Head
casting number 3883863 fits OK. The other head, 3856759 has the push rod
tube fit problem. The head gasket surface is 0.060 deeper into the head
than the -63 head, and the surface where the push rod tubes sit is 0.125
deeper, causing the tubes to be high.

My old Tech Manual does not list 3883863 (the head that fits), but other
sources call it 65-67 110 hp, no smog.

The manual calls head 3856759 (the head that does not fit) 1965 110 hp,
no smog.

I realize that we need to have matching head casting numbers, but does
anybody have an idea as to why the thickness of he heads are different?

John Ryall 

On Tue, 14 Aug 2018 12:13:07 +0000 (UTC) Charles Cromwell via
VirtualVairs <virtualvairs at corvair.org> writes:
> Hello all A friend of mine has a rebuild problem. the engine is being 
> rebuilt by a pro. shop. The left side the push rod tubes stick op 
> about 1/8 of an inch. The head has not been altered and measures the 
> same as another head . the cylinders measure correct . Any ideas 
> , Clark has no idea . Chuck Cromwell

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